Assuming you mean "opera buffa" then the definition would be a comedic opera, as opposed to an "opera seria," meaning "serious opera."
Opera is the plural form of opus, operis and it mean works or fortifications
the Chinese opera masks were invented because when people where at the opera they could see what the colours all mean and what the opera was about.
the latin word opera means (work)
The Beggars Opera is a ballad opera (1728) with text by John Gay and music arranged by John Pepusch.
I think you mean The Opera house in Sidney Australia
Paris opera glasses mayor
If by Play you mean drama and script, then when Opera is to sing, Play is to act.
Just as in the theatrical sense, characterized by its dramatic plot lines.
the Chinese use masks for the opera because there was a lot of different moods for the opera and all the colours mean different things
In opera, everything (I mean EVERYTHING) is sang out. In a musical, it is just a play with breaks of song.
Oper means opera.